Use static methods where applicable. A method declared static tends to execute faster 
than any other type of method declaration. Next are final methods, followed by instance 
methods, and last, synchronized methods. 
5.5.2  Apache and Tomcat Web Server Integration 
The Tomcat web server can serve both static and dynamic web pages. However, if a web site 
contains a significant number of static pages, using the Apache web server for the static content 
can increase the application's performance. The Apache web server is also an open source 
product developed by the Jakarta project (like Tomcat). 
Besides the performance increase, there are several other reasons that make the combination 
of Apache with Tomcat a good choice: 
   The Tomcat web server is not as configurable as Apache. 
   Tomcat is not as robust as Apache. 
   Apache provides some additional functionality that cannot be found under Tomcat (e.g. 
modules for Perl or PHP). 
When running in combination with Apache, Tomcat is configured as an add on to the Apache 
web server. Apache and Tomcat work together in the following way: Apache serves as the main 
web server that listens for client requests. Before Apache processes a request, the request is 
checked whether it refers to a dynamic web page (a servlet or JSP page). If a servlet or JSP 
page is requested, Apache forwards the request to the Tomcat web server, which processes it. 
Otherwise, Apache directly serves the request. 
To achieve this behavior, both Apache's and Tomcat's configuration files have to be modified. 
Furthermore, an additional module has to be added to the Apache environment (either 
mod_jserv or mod_jk   the latter is the newer module, it is easier to configure and can handle 
the secure https protocol).  

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